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Plotting the the acceleration data of the degree of freedom versus the time.

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Obsidian
Obsidian 2021-7-19
评论： Obsidian 2021-7-19
I am given the data for acceleration (almost 3 pages) and the question says that the sampling rate for all of the experiments was 50 Hz (50 samples per second, or delta_t= 0.02 sec. I am supposed to plot the acceleration data vs time and also find the peaks of acceleration that accurs during the free vibration. I loaded the acceleration data file and extracted data from the column but I am not sure how to specify the time data when I am only given the time step and how to mark the peaks. I appreciate the help! I get the following error:
Code:
clc; clear all; close all;
load VibrationSDOF_Data.txt
acc = VibrationSDOF_Data(:,1);
time =[0: 0.02: 110]
plot (time,acc,'r-');
Error:
error using plot
vectors must be the same length

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采纳的回答

Walter Roberson
Walter Roberson 2021-7-19
Change
time =[0: 0.02: 110]
to
dt = 0.02;
time = (0:numel(acc)-1) * dt;
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Walter Roberson
Walter Roberson 2021-7-19
Finding peaks of noisy data is a bit difficult to reliably tell the difference between noise and signal.
Especially with acceleration data (which is notorious for being noisy), it is common to first apply a low-pass filter or moving-median filter. After that, there are a number of different approaches.
One of the approaches is to use max() to find the maximum; that is one peak. Then set that location and a distance on each side of it to NaN, and find the max() again. Keep repeating that until the max value you found is less than some threshold you set .

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Chunru
Chunru 2021-7-19
Make sure time and acc have the same size
time =[0: length(acc)-1]*0.02;
plot (time,acc,'r-');

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